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Wont boot, makes an error code if plugged into the wall

My MacBook Pro won’t boot at all, just a black screen all the time. If you lift the keyboard from the back of the machine (with it being unscrewed) the sleep light will get brighter, and if I plug it into the wall with no battery it blinks rapidly and doesn’t change brightness.

Edit: The blinking light has gone away. In that time I’ve reseated everything, so I have no clue what caused it, but I’m glad it has disappeared

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The sleep light stays on like the screen is closed, but I can say for sure the screen isn't

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